2624677-A1 is referenced by 17 patents and cites 4 patents.

The system includes a first and a second transmitter/receiver means 1, 2, the first transmitter/receiver means comprising transmission means 11 for a continuous electromagnetic wave and means 12 for amplitude modulation of this wave. It also includes means 13 for monitoring and controlling the amplitude modulating means and means 14 for receiving the electromagnetic signal transmitted by the second transmitter/receiver means 2.; The latter in turn includes means 21 for the continuous or amplitude-modulated electromagnetic wave transmitted by the first transmitter/receiver means 1 and means 22 reflecting the continuous electromagnetic wave in order to generate a reflected continuous electromagnetic wave and means 23 for amplitude modulation of the reflected electromagnetic wave in order to generate the electromagnetic signal transmitted by the second transmitter/receiver means 2 to the first. Monitoring means 24 make it possible to control amplitude modulating means 23 and receiver means 21. Application to hands-free toll collection, to the deduction of user consumption units U, and to toll collection for motor vehicles on non-zero speed motorways.

Title
Bidirectional radio link system
Application Number
FR19870017219 19871210
Publication Number
2624677 (A1)
Application Date
December 10, 1987
Publication Date
June 16, 1989
Inventor
Leger Richard
Preti Jean Claude
Assignee
Sfim
FR
IPC
H04B7/26
H04B 07/26
G07B15/00
G07B 15/00
G01D1/00
G01D 01/00
G07C9/00
G07C 09/00
G07B15/00
G07B 15/00
G06K7/10
G06K 07/10
G01S13/00
G01S 13/00
G07C9/00
G07C 09/00
G07B15/00
G07B 15/00
G06K7/10
G06K 07/10
G01S13/82
G01S 13/82
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